package com.hhwy.framework.persistent.dialect;

import java.sql.Types;

import org.hibernate.dialect.Dialect;

/**
 * <b>类 名 称：</b>SQLiteDialect JPA对SQLite方言支持<br/>
 * <b>类 描 述：</b><br/>
 * <b>创 建 人：</b>lihuiming<br/>
 * <b>修 改 人：</b>Administrator<br/>
 * <b>修改时间：</b>2014年8月14日 下午4:26:01<br/>
 * <b>修改备注：</b><br/>
 * @version 1.0.0<br/>
 */
public class SQLiteDialect extends Dialect {

	public SQLiteDialect() {

		super();

		registerColumnType(Types.BIT, "integer");

		registerColumnType(Types.TINYINT, "tinyint");

		registerColumnType(Types.SMALLINT, "smallint");

		registerColumnType(Types.INTEGER, "integer");

		registerColumnType(Types.BIGINT, "bigint");

		registerColumnType(Types.FLOAT, "float");

		registerColumnType(Types.REAL, "real");

		registerColumnType(Types.DOUBLE, "double");

		registerColumnType(Types.NUMERIC, "numeric");

		registerColumnType(Types.DECIMAL, "decimal");

		registerColumnType(Types.CHAR, "char");

		registerColumnType(Types.VARCHAR, "varchar");

		registerColumnType(Types.LONGVARCHAR, "longvarchar");

		registerColumnType(Types.DATE, "date");

		registerColumnType(Types.TIME, "time");

		registerColumnType(Types.TIMESTAMP, "timestamp");

		registerColumnType(Types.BINARY, "blob");

		registerColumnType(Types.VARBINARY, "blob");

		registerColumnType(Types.LONGVARBINARY, "blob");

		// registerColumnType(Types.NULL, "null");

		registerColumnType(Types.BLOB, "blob");

		registerColumnType(Types.CLOB, "clob");

		registerColumnType(Types.BOOLEAN, "integer");

		// registerFunction("concat", new VarArgsSQLFunction(Hibernate.STRING,
		// "", "||", ""));
		//
		// registerFunction("mod", new SQLFunctionTemplate(Hibernate.INTEGER,
		// "?1 % ?2"));
		//
		// registerFunction("substr", new StandardSQLFunction("substr",
		// Hibernate.STRING));
		//
		// registerFunction("substring", new StandardSQLFunction("substr",
		// Hibernate.STRING));

	}

	public boolean supportsIdentityColumns() {
		return true;
	}

	/*
	 * public boolean supportsInsertSelectIdentity() { return true; // As
	 * specify in NHibernate dialect
	 * }
	 */

	public boolean hasDataTypeInIdentityColumn() {
		return false; // As specify in NHibernate dialect
	}

	/*
	 * public String appendIdentitySelectToInsert(String insertString) {
	 * 
	 * return new StringBuffer(insertString.length()+30). // As specify in
	 * NHibernate dialect append(insertString).
	 * append("; ").append(getIdentitySelectString()). toString(); }
	 */

	public String getIdentityColumnString() {

		// return "integer primary key autoincrement";
		return "integer";
	}

	public String getIdentitySelectString() {
		return "select last_insert_rowid()";
	}

	public boolean supportsLimit() {
		return true;
	}

	public String getLimitString(String query, boolean hasOffset) {

		return new StringBuffer(query.length() + 20).append(query).append(
		hasOffset ? " limit ? offset ?" : " limit ?").toString();

	}

	public boolean supportsTemporaryTables() {
		return true;
	}

	public String getCreateTemporaryTableString() {
		return "create temporary table if not exists";
	}

	public boolean dropTemporaryTableAfterUse() {
		return false;
	}

	public boolean supportsCurrentTimestampSelection() {
		return true;
	}

	public boolean isCurrentTimestampSelectStringCallable() {
		return false;
	}

	public String getCurrentTimestampSelectString() {
		return "select current_timestamp";
	}

	public boolean supportsUnionAll() {
		return true;
	}

	public boolean hasAlterTable() {
		return false; // As specify in NHibernate dialect
	}

	public boolean dropConstraints() {
		return false;
	}

	public String getAddColumnString() {
		return "add column";
	}

	public String getForUpdateString() {
		return "";
	}

	public boolean supportsOuterJoinForUpdate() {
		return false;
	}

	public String getDropForeignKeyString() {
		
		throw new UnsupportedOperationException(
		"No drop foreign key syntax supported by SQLiteDialect");

	}

	public String getAddForeignKeyConstraintString(String constraintName,

	String[] foreignKey, String referencedTable, String[] primaryKey,

	boolean referencesPrimaryKey) {

		throw new UnsupportedOperationException(
		"No add foreign key syntax supported by SQLiteDialect");

	}

	public String getAddPrimaryKeyConstraintString(String constraintName) {

		throw new UnsupportedOperationException(
		"No add primary key syntax supported by SQLiteDialect");

	}

	public boolean supportsIfExistsBeforeTableName() {
		return true;
	}

	public boolean supportsCascadeDelete() {
		return false;
	}

	/**
	 * 修复分页bug
	 */
	@Override
	public boolean bindLimitParametersInReverseOrder() {
		return true;
	}

}
